列出内核模块中的块设备

Question

我正在编写一个内核模块，列出了我将用于跟踪的块设备及其相应的dev_t。

以下是结构block_device

    struct block_device {
    dev_t           bd_dev;  /* not a kdev_t - it's a search key */
    int         bd_openers;
    struct inode *      bd_inode;   /* will die */
    struct super_block *    bd_super;
    struct mutex        bd_mutex;   /* open/close mutex */
    struct list_head    bd_inodes;
    void *          bd_claiming;
    void *          bd_holder;
    int         bd_holders;
    bool            bd_write_holder;
#ifdef CONFIG_SYSFS
    struct list_head    bd_holder_disks;
#endif
    struct block_device *   bd_contains;
    unsigned        bd_block_size;
    struct hd_struct *  bd_part;
    /* number of times partitions within this device have been opened. */
    unsigned        bd_part_count;
    int         bd_invalidated;
    struct gendisk *    bd_disk;
    struct request_queue *  bd_queue;
    struct list_head    bd_list;
............
};

bd_list是一个包含系统中所有块设备的链接列表。 all_bdevs（fs / block_dev.c）是列表的头部，但是它没有被导出的问题。 有没有办法在内核模块中迭代块设备？